Bro I just applied one logic that , the other one can't be possible as we know in case of potentiometer precaution is that we have to apply connection with positive(net overall) end to be in connection with emf cell.positive . got it @Viraam_Rao bro ??

@Azimuddin_Sheikh u know i was very confused why +ve is connected to +ve when was learning for practical but when u posted this pic i thought about it again and got the reason
Thanks to u otherwise i would be confused all through my life